Foster joined the Canadian Forces in 1982[1] as one of the candidates in a trial program called SWINTER (Service-Women in Non-Traditional Environments and Roles.

[4] She worked as an instructor at 2CFFTS for four years; in 1988, she was selected to be in the first cadre of female pilots to fly Canada's McDonnell Douglas CF-18 Hornet, commonly known as the CF-18 Fighter Jets.

"[5][9] As a member of 441 Tactical Fighter Squadron, a NORAD unit, she participated in the intercept and escort of the first Soviet aircraft, a MiG-29 Fulcrum, to fly in Canadian airspace.

Ed Vanwoudenberg, the leader of the Christian Heritage Party of Canada, claimed that God did not intend for women to engage in high-speed flight, and that the force of the planes would damage their fertility.

[5] After flying the fighter jets for a year, Foster opted to transition into a ground job by choice, mentioning that operating the aircraft was "a little frightening.